Radio frequency transmitter



May 18, 1937. M PONTE 2,080,577

RADIO FREQUENCY TRANSMITTER Original Filed Nov. 1, 1934 12 11 Ji z INVENTOR MAURICE PONTE ATTORNEY Patented May 18, 1937 UNITED STATES PATENT OFFICE Maurice Ponte, Paris, France, assignor to Compagnie Generale de Telegraphic Sans Fil, a

corporation of France Application November 1, 1934, Serial No. 751,018.

Renewed September 22, 1936.

vember 13, 1933 Claims.

In my Patent No. 2,026,652, granted January 7,

1936 there has been disclosed a system adapted to transmit radio frequency energy to an antenna located above ground at a very great dis- 5 tance or height as compared with the wave length, or, more generally speaking, at a very great distance from the transmitter, the arrangement in question having since been in successful use for the transmission of energy to antennae 0 located a hundred wave lengths or so above the transmitter. This patent, supra, discloses an apparatus for short waves connected with an antenna located at a height equal to several wave lengths above the apparatus, the connecting feeder comprising a conductor united, on the one hand, with the antenna, and on the other hand with the apparatus, and an envelope provided to shield the said conductor. In order to prevent any lines of force issued from the antenna from becoming closed upon the said envelope or shield,

which would result in the envelope absorbing unnecessarily energy between the apparatus and the antenna, there has been provided a surface at right angles to the antenna and united with 5 the envelope in the neighborhood of the end of 1, plane, and it has been stated that in case of a single-wire straight antenna having a length of a quarter-Wave, the optimum radius of the surface or the optimum length of each wire of the said bundle was also to be one-quarter wave. The said surface could also be used to act as a support for a reflector designed to impart to the radiation of the antenna directive properties.

According to the present invention, the same device is employed for insuring transmission of energy to an antenna system possessing directional properties and for providing an antenna of a special structure which could be called a scale structure. For this purpose, the whole assembly is supported by a tubular feeder, and 5 the radiating antennae supported by the central tube or rod are fitted into openings of the feeder; the latter being furnished, at about the level of each opening, with metallic plates or Wires of suitable length in an arrangement of 5 the kind disclosed in the copending application. The number of the antennae, their distance and their length are governed by the purpose for which they are intended.

This invention will best be understood by re- 55 ferring to the accompanying drawing, in which:

In France No- Fig. l is a structural diagram of an improved antenna;

Fig. 2 is a structural diagram of another form of improved antenna;

'Fig. 3 is an exemplified embodiment of an upper portion of an antenna structure, this upper portion being shown in section; while Fig. 4 is a longitudinal section of the upper portion of the antenna structure shown in Fig. 1.

Referring to Figs. 1 and 2, there is shown an exemplified embodiment of the invention in the shape of a structure of the scale type designed to insure a maximum radiation in the normal to the plane of (or laid through) the antennae; in other words, in the directions A-B indicated in Fig. 2. Fig. 3 shows a preferred, rugged type of aerial system. i

The invention is here described in connection with horizontal polarization, though it will be understood that the scheme is not confined thereto. The outside tube of the feederi, 5 has an interior conductor with which are united the antennae 6, 6, the distance of which, in the example here chosen, is equal to M2. To insure radiation normal with reference to the plane' laid through the antennae, the antennae which are at a distance an odd multiple of M2 are opposite to the tube. The antennae are passed through the latter by way of openings formed in the tube; and the latter, at points being on a level with the said holes, is furnished with means 1, I of the kind disclosed in my Patent No. 2,026,652, and indicated in this case as consisting of bundles of eight wires. They could consist also of solid plates, and they could be furnished with suitable reflectors.

The feeder is connected according to the necessary length or distance with the transmitter E.

It will be understood that the invention allows of realizing directional systems especially adapted to ultra short waves and are very simple; the whole assembly being disposed upon a single tube. The assembly could be revolved for the purpose of providing a radio beacon. The arrangement is equally adapted to various arrangements which fall inside the scope of this invention and which consist in the respective or relative positions of the antennae so as to impart to the assembly any desired properties such as the disposition of the antenna helix-fashion about the central tube, the combination of various diagrams, etc.

Finally, the present invention creates aerials, especially for ultra-short waves that are extremely rugged and rigid, by completely confining the sending antenna or antennae inside an insulation sleeve or bushing which supports the antenna and prevents it from vibrating. One

such arrangement is shown in Fig. 3.

4 which supports it rigidly and prevents vibrations in reference to the feeder which might occasion variations in wave length in the case of self-excited oscillators and in the amplitude for stabilized oscillators. The device 3 itself could be propped by brace means 5, 5.

What I claim is:

1. Antenna system coupled to a high frequency circuit, comprising a feeder composed of a rigid tube and a conductor located within this tube and connected to the high frequency circuit, several radiating elements mounted along the length of said tube but insulated therefrom and connected to the said conductor, and means connected to the tube for eliminating the electrostatical coupling between each radiating element and the tube.

2. Antenna system coupled to a high frequency circuit, comprising a feeder composed of a rigid tube and a conductor located within this tube and connected to the high frequency circuit, several radiating elements penetrating through holes provided along the surface of the said tube and connected to the said conductor, said radiating elements being contained within insulating sleeves fixed on the said tube, and means connected to the tube for eliminating the electrostatical coupling between each radiating element and the tube.

3. Antenna system coupled to a high frequency circuit, comprising a feeder composed of a rigid tube and a conductor located within this tube and connected to the high frequency circuit, several radiating elements mounted along the length of said tube but insulated therefrom and connected to the said conductor, and metallic surfaces perpendicular to the radiating elements and connected to the tube to eliminate the radiation of the feeder.

4. Antenna system coupled to a high frequency circuit, comprising a feeder composed of a rigid tube and a conductor located within this tube and connected to the high frequency circuit, several radiating elements mounted along the length of said tube but insulated therefrom and connected to said conductor, said radiating elements being spaced apart from one another by a distance equal to an odd multiple of one-half the length of the operating wave, and means connected to the tube for eliminating the electrostatical coupling between each radiating element and the tube. J

5. Antenna system coupled to a. high frequency circuit, comprising a feeder composed of a rigid metallic tube and a conductor located within this tube and connected to the high frequency circuit, and several radiating elements mounted along the length of said tube but insulated therefrom and connected to said conductor through apertures in said tube, said radiating elements being spaced apart from one another by a distance equal to an odd multiple of one-half the length of the operating wave.

6. An antenna system comprising a feeder arrangement having inner and outer metallic conductors, a plurality of radiating elements mounted along the length of said feeder arrangement, said radiating elements being connected to said inner conductor through apertures in said outer conductor, and high frequency apparatus cou pled to the inner conductor of said feeder arrangement.

'7. An antenna system in .accordance with claim 6, characterized in this that said radiating elements are separated from one another by a distance substantially equal to half of the length rangement having an inner and anouter conduc-r' tor, a plurality of radiating elements located in parallel planes connected to said inner conductor through apertures in said outer conductor along the length of said inner conductor, and high frequency apparatus coupled to said inner conductor.

9. An antenna system in accordance with claim 8, characterized in this that said radiating elements extend substantially perpendicular to the feeder, the length of each element being approximately one-quarter of the length of the operating wave.

10. An antenna system in accordance with claim 8, characterized in this that the overall length of a radiating element in the same straight line is substantially one-half the length of the operating wave.

MAURICE PON'I'E. 

